Combined digital speckle shearing interferometry and digital image correlation for analyzing vibrating objects

Fook Siong Chau; Jiang Zhou

doi:10.1117/12.429606

13 June 2001 Combined digital speckle shearing interferometry and digital image correlation for analyzing vibrating objects

Fook Siong Chau, Jiang Zhou

Author Affiliations +

Proceedings Volume 4317, Second International Conference on Experimental Mechanics; (2001) https://doi.org/10.1117/12.429606
Event: Second International Conference on Experimental Mechanics, 2000, Singapore, Singapore

Abstract

Digital speckle shearing interferometry is an optical method for measuring displacement derivatives directly and has gained wide acceptance for many industrial applications. Although it has a reputation for being insensitivity o vibration, an unfavorable environment may cause severe deterioration of the typical double-eye fringe pattern, making interpretation difficult. Digital image correlation has been found to be capable of detection displacement os points on images of illuminated object surface to a high degree of accuracy. This is achieved through a relatively simple set-up. This paper presents a method of compensating for any vibration of the object under study and thus alleviating the adverse effects of vibration on the quality of fringe patterns obtained by DSSI. This is achieved by incorporating DIC Into DSSI before the image subtraction phase of the technique. It is shown that good quality fringes can be obtained successfully for specimens vibrating at 25 Hz with amplitudes of up to 1mm.

Citation Download Citation

Fook Siong Chau and Jiang Zhou "Combined digital speckle shearing interferometry and digital image correlation for analyzing vibrating objects", Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); https://doi.org/10.1117/12.429606

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